condition mean min max ZT0-3 4.85 4.85 4.85 ZT4-7 1.6 1.6 1.6 ZT8-11 5.15 5.15 5.15 ZT12-15 5.4 5.4 5.4 ZT16-19 18.2 18.2 18.2 ZT20-23 22.200000000000003 22.200000000000003 22.200000000000003